Background: The incidence of infantile dermatoses shows a tendency to increase, despite medical development and environmental improvement. Infantile dermatoses must be regarded discretely, due to special characteristics of the neonatal and infantile skin. Objective: The purpose of this study is to evaluate the incidence of dermatologic diseases in the infant patients. Methods: One hundred fifty nine out-patients, younger than 1 year who had visited the department of dermatology from January 2001 to December 2011, were analyzed, retrospectively. Results: The 0∼1 year age group accounted for 0.58% of all new patients (261/44,718). The ratio of male to female was 1 to 0.69. Patients visited the hospital most frequently in the winter (34.5%). The most common disease was atopic dermatitis (30.3%), followed by hemangioma (9.2%), and irritant contact dermatitis (7.7%). The most common disease group was eczema (44.8%), followed by an infectious skin disease (19.2%), and dermal and subcutaneous tumors (10.7%). Conclusion: This study provides useful data on the incidence and characteristics of dermatologic diseases in infant patients.